2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
5 * Copyright IBM Corp. 2002,2008
6 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
7 * Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/spinlock.h>
13 #include <linux/errno.h>
14 #include <linux/err.h>
15 #include <linux/slab.h>
16 #include <linux/list.h>
17 #include <linux/device.h>
18 #include <linux/workqueue.h>
19 #include <linux/timer.h>
21 #include <asm/ccwdev.h>
23 #include <asm/param.h> /* HZ */
29 #include "cio_debug.h"
34 #include "blacklist.h"
36 static struct timer_list recovery_timer
;
37 static DEFINE_SPINLOCK(recovery_lock
);
38 static int recovery_phase
;
39 static const unsigned long recovery_delay
[] = { 3, 30, 300 };
41 /******************* bus type handling ***********************/
43 /* The Linux driver model distinguishes between a bus type and
44 * the bus itself. Of course we only have one channel
45 * subsystem driver and one channel system per machine, but
46 * we still use the abstraction. T.R. says it's a good idea. */
48 ccw_bus_match (struct device
* dev
, struct device_driver
* drv
)
50 struct ccw_device
*cdev
= to_ccwdev(dev
);
51 struct ccw_driver
*cdrv
= to_ccwdrv(drv
);
52 const struct ccw_device_id
*ids
= cdrv
->ids
, *found
;
57 found
= ccw_device_id_match(ids
, &cdev
->id
);
61 cdev
->id
.driver_info
= found
->driver_info
;
66 /* Store modalias string delimited by prefix/suffix string into buffer with
67 * specified size. Return length of resulting string (excluding trailing '\0')
68 * even if string doesn't fit buffer (snprintf semantics). */
69 static int snprint_alias(char *buf
, size_t size
,
70 struct ccw_device_id
*id
, const char *suffix
)
74 len
= snprintf(buf
, size
, "ccw:t%04Xm%02X", id
->cu_type
, id
->cu_model
);
80 if (id
->dev_type
!= 0)
81 len
+= snprintf(buf
, size
, "dt%04Xdm%02X%s", id
->dev_type
,
82 id
->dev_model
, suffix
);
84 len
+= snprintf(buf
, size
, "dtdm%s", suffix
);
89 /* Set up environment variables for ccw device uevent. Return 0 on success,
90 * non-zero otherwise. */
91 static int ccw_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
93 struct ccw_device
*cdev
= to_ccwdev(dev
);
94 struct ccw_device_id
*id
= &(cdev
->id
);
96 char modalias_buf
[30];
99 ret
= add_uevent_var(env
, "CU_TYPE=%04X", id
->cu_type
);
104 ret
= add_uevent_var(env
, "CU_MODEL=%02X", id
->cu_model
);
108 /* The next two can be zero, that's ok for us */
110 ret
= add_uevent_var(env
, "DEV_TYPE=%04X", id
->dev_type
);
115 ret
= add_uevent_var(env
, "DEV_MODEL=%02X", id
->dev_model
);
120 snprint_alias(modalias_buf
, sizeof(modalias_buf
), id
, "");
121 ret
= add_uevent_var(env
, "MODALIAS=%s", modalias_buf
);
125 struct bus_type ccw_bus_type
;
127 static void io_subchannel_irq(struct subchannel
*);
128 static int io_subchannel_probe(struct subchannel
*);
129 static int io_subchannel_remove(struct subchannel
*);
130 static void io_subchannel_shutdown(struct subchannel
*);
131 static int io_subchannel_sch_event(struct subchannel
*, int);
132 static int io_subchannel_chp_event(struct subchannel
*, struct chp_link
*,
135 static struct css_device_id io_subchannel_ids
[] = {
136 { .match_flags
= 0x1, .type
= SUBCHANNEL_TYPE_IO
, },
137 { /* end of list */ },
139 MODULE_DEVICE_TABLE(css
, io_subchannel_ids
);
141 static struct css_driver io_subchannel_driver
= {
142 .owner
= THIS_MODULE
,
143 .subchannel_type
= io_subchannel_ids
,
144 .name
= "io_subchannel",
145 .irq
= io_subchannel_irq
,
146 .sch_event
= io_subchannel_sch_event
,
147 .chp_event
= io_subchannel_chp_event
,
148 .probe
= io_subchannel_probe
,
149 .remove
= io_subchannel_remove
,
150 .shutdown
= io_subchannel_shutdown
,
153 struct workqueue_struct
*ccw_device_work
;
154 wait_queue_head_t ccw_device_init_wq
;
155 atomic_t ccw_device_init_count
;
157 static void recovery_func(unsigned long data
);
160 init_ccw_bus_type (void)
164 init_waitqueue_head(&ccw_device_init_wq
);
165 atomic_set(&ccw_device_init_count
, 0);
166 setup_timer(&recovery_timer
, recovery_func
, 0);
168 ccw_device_work
= create_singlethread_workqueue("cio");
169 if (!ccw_device_work
)
170 return -ENOMEM
; /* FIXME: better errno ? */
171 slow_path_wq
= create_singlethread_workqueue("kslowcrw");
173 ret
= -ENOMEM
; /* FIXME: better errno ? */
176 if ((ret
= bus_register (&ccw_bus_type
)))
179 ret
= css_driver_register(&io_subchannel_driver
);
183 wait_event(ccw_device_init_wq
,
184 atomic_read(&ccw_device_init_count
) == 0);
185 flush_workqueue(ccw_device_work
);
189 destroy_workqueue(ccw_device_work
);
191 destroy_workqueue(slow_path_wq
);
196 cleanup_ccw_bus_type (void)
198 css_driver_unregister(&io_subchannel_driver
);
199 bus_unregister(&ccw_bus_type
);
200 destroy_workqueue(ccw_device_work
);
203 subsys_initcall(init_ccw_bus_type
);
204 module_exit(cleanup_ccw_bus_type
);
206 /************************ device handling **************************/
209 * A ccw_device has some interfaces in sysfs in addition to the
211 * The following entries are designed to export the information which
212 * resided in 2.4 in /proc/subchannels. Subchannel and device number
213 * are obvious, so they don't have an entry :)
214 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
217 chpids_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
219 struct subchannel
*sch
= to_subchannel(dev
);
220 struct chsc_ssd_info
*ssd
= &sch
->ssd_info
;
225 for (chp
= 0; chp
< 8; chp
++) {
227 if (ssd
->path_mask
& mask
)
228 ret
+= sprintf(buf
+ ret
, "%02x ", ssd
->chpid
[chp
].id
);
230 ret
+= sprintf(buf
+ ret
, "00 ");
232 ret
+= sprintf (buf
+ret
, "\n");
233 return min((ssize_t
)PAGE_SIZE
, ret
);
237 pimpampom_show (struct device
* dev
, struct device_attribute
*attr
, char * buf
)
239 struct subchannel
*sch
= to_subchannel(dev
);
240 struct pmcw
*pmcw
= &sch
->schib
.pmcw
;
242 return sprintf (buf
, "%02x %02x %02x\n",
243 pmcw
->pim
, pmcw
->pam
, pmcw
->pom
);
247 devtype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
249 struct ccw_device
*cdev
= to_ccwdev(dev
);
250 struct ccw_device_id
*id
= &(cdev
->id
);
252 if (id
->dev_type
!= 0)
253 return sprintf(buf
, "%04x/%02x\n",
254 id
->dev_type
, id
->dev_model
);
256 return sprintf(buf
, "n/a\n");
260 cutype_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
262 struct ccw_device
*cdev
= to_ccwdev(dev
);
263 struct ccw_device_id
*id
= &(cdev
->id
);
265 return sprintf(buf
, "%04x/%02x\n",
266 id
->cu_type
, id
->cu_model
);
270 modalias_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
272 struct ccw_device
*cdev
= to_ccwdev(dev
);
273 struct ccw_device_id
*id
= &(cdev
->id
);
276 len
= snprint_alias(buf
, PAGE_SIZE
, id
, "\n");
278 return len
> PAGE_SIZE
? PAGE_SIZE
: len
;
282 online_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
284 struct ccw_device
*cdev
= to_ccwdev(dev
);
286 return sprintf(buf
, cdev
->online
? "1\n" : "0\n");
289 int ccw_device_is_orphan(struct ccw_device
*cdev
)
291 return sch_is_pseudo_sch(to_subchannel(cdev
->dev
.parent
));
294 static void ccw_device_unregister(struct ccw_device
*cdev
)
296 if (test_and_clear_bit(1, &cdev
->private->registered
))
297 device_del(&cdev
->dev
);
300 static void ccw_device_remove_orphan_cb(struct work_struct
*work
)
302 struct ccw_device_private
*priv
;
303 struct ccw_device
*cdev
;
305 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
307 ccw_device_unregister(cdev
);
308 put_device(&cdev
->dev
);
309 /* Release cdev reference for workqueue processing. */
310 put_device(&cdev
->dev
);
313 static void ccw_device_call_sch_unregister(struct work_struct
*work
);
316 ccw_device_remove_disconnected(struct ccw_device
*cdev
)
321 * Forced offline in disconnected state means
322 * 'throw away device'.
324 /* Get cdev reference for workqueue processing. */
325 if (!get_device(&cdev
->dev
))
327 if (ccw_device_is_orphan(cdev
)) {
329 * Deregister ccw device.
330 * Unfortunately, we cannot do this directly from the
333 spin_lock_irqsave(cdev
->ccwlock
, flags
);
334 cdev
->private->state
= DEV_STATE_NOT_OPER
;
335 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
336 PREPARE_WORK(&cdev
->private->kick_work
,
337 ccw_device_remove_orphan_cb
);
339 /* Deregister subchannel, which will kill the ccw device. */
340 PREPARE_WORK(&cdev
->private->kick_work
,
341 ccw_device_call_sch_unregister
);
342 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
346 * ccw_device_set_offline() - disable a ccw device for I/O
347 * @cdev: target ccw device
349 * This function calls the driver's set_offline() function for @cdev, if
350 * given, and then disables @cdev.
352 * %0 on success and a negative error value on failure.
354 * enabled, ccw device lock not held
356 int ccw_device_set_offline(struct ccw_device
*cdev
)
362 if (!cdev
->online
|| !cdev
->drv
)
365 if (cdev
->drv
->set_offline
) {
366 ret
= cdev
->drv
->set_offline(cdev
);
371 spin_lock_irq(cdev
->ccwlock
);
372 ret
= ccw_device_offline(cdev
);
373 if (ret
== -ENODEV
) {
374 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
) {
375 cdev
->private->state
= DEV_STATE_OFFLINE
;
376 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
378 spin_unlock_irq(cdev
->ccwlock
);
379 /* Give up reference from ccw_device_set_online(). */
380 put_device(&cdev
->dev
);
383 spin_unlock_irq(cdev
->ccwlock
);
385 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
386 /* Give up reference from ccw_device_set_online(). */
387 put_device(&cdev
->dev
);
389 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
390 "device 0.%x.%04x\n",
391 ret
, cdev
->private->dev_id
.ssid
,
392 cdev
->private->dev_id
.devno
);
399 * ccw_device_set_online() - enable a ccw device for I/O
400 * @cdev: target ccw device
402 * This function first enables @cdev and then calls the driver's set_online()
403 * function for @cdev, if given. If set_online() returns an error, @cdev is
406 * %0 on success and a negative error value on failure.
408 * enabled, ccw device lock not held
410 int ccw_device_set_online(struct ccw_device
*cdev
)
416 if (cdev
->online
|| !cdev
->drv
)
418 /* Hold on to an extra reference while device is online. */
419 if (!get_device(&cdev
->dev
))
422 spin_lock_irq(cdev
->ccwlock
);
423 ret
= ccw_device_online(cdev
);
424 spin_unlock_irq(cdev
->ccwlock
);
426 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
428 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
429 "device 0.%x.%04x\n",
430 ret
, cdev
->private->dev_id
.ssid
,
431 cdev
->private->dev_id
.devno
);
432 /* Give up online reference since onlining failed. */
433 put_device(&cdev
->dev
);
436 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
437 /* Give up online reference since onlining failed. */
438 put_device(&cdev
->dev
);
441 if (!cdev
->drv
->set_online
|| cdev
->drv
->set_online(cdev
) == 0) {
445 spin_lock_irq(cdev
->ccwlock
);
446 ret
= ccw_device_offline(cdev
);
447 spin_unlock_irq(cdev
->ccwlock
);
449 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
451 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
452 "device 0.%x.%04x\n",
453 ret
, cdev
->private->dev_id
.ssid
,
454 cdev
->private->dev_id
.devno
);
455 /* Give up online reference since onlining failed. */
456 put_device(&cdev
->dev
);
457 return (ret
== 0) ? -ENODEV
: ret
;
460 static int online_store_handle_offline(struct ccw_device
*cdev
)
462 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
)
463 ccw_device_remove_disconnected(cdev
);
464 else if (cdev
->online
&& cdev
->drv
&& cdev
->drv
->set_offline
)
465 return ccw_device_set_offline(cdev
);
469 static int online_store_recog_and_online(struct ccw_device
*cdev
)
473 /* Do device recognition, if needed. */
474 if (cdev
->id
.cu_type
== 0) {
475 ret
= ccw_device_recognition(cdev
);
477 CIO_MSG_EVENT(0, "Couldn't start recognition "
478 "for device 0.%x.%04x (ret=%d)\n",
479 cdev
->private->dev_id
.ssid
,
480 cdev
->private->dev_id
.devno
, ret
);
483 wait_event(cdev
->private->wait_q
,
484 cdev
->private->flags
.recog_done
);
486 if (cdev
->drv
&& cdev
->drv
->set_online
)
487 ccw_device_set_online(cdev
);
490 static int online_store_handle_online(struct ccw_device
*cdev
, int force
)
494 ret
= online_store_recog_and_online(cdev
);
497 if (force
&& cdev
->private->state
== DEV_STATE_BOXED
) {
498 ret
= ccw_device_stlck(cdev
);
501 if (cdev
->id
.cu_type
== 0)
502 cdev
->private->state
= DEV_STATE_NOT_OPER
;
503 online_store_recog_and_online(cdev
);
508 static ssize_t
online_store (struct device
*dev
, struct device_attribute
*attr
,
509 const char *buf
, size_t count
)
511 struct ccw_device
*cdev
= to_ccwdev(dev
);
515 if (atomic_cmpxchg(&cdev
->private->onoff
, 0, 1) != 0)
518 if (cdev
->drv
&& !try_module_get(cdev
->drv
->owner
)) {
519 atomic_set(&cdev
->private->onoff
, 0);
522 if (!strncmp(buf
, "force\n", count
)) {
528 ret
= strict_strtoul(buf
, 16, &i
);
534 ret
= online_store_handle_offline(cdev
);
537 ret
= online_store_handle_online(cdev
, force
);
544 module_put(cdev
->drv
->owner
);
545 atomic_set(&cdev
->private->onoff
, 0);
546 return (ret
< 0) ? ret
: count
;
550 available_show (struct device
*dev
, struct device_attribute
*attr
, char *buf
)
552 struct ccw_device
*cdev
= to_ccwdev(dev
);
553 struct subchannel
*sch
;
555 if (ccw_device_is_orphan(cdev
))
556 return sprintf(buf
, "no device\n");
557 switch (cdev
->private->state
) {
558 case DEV_STATE_BOXED
:
559 return sprintf(buf
, "boxed\n");
560 case DEV_STATE_DISCONNECTED
:
561 case DEV_STATE_DISCONNECTED_SENSE_ID
:
562 case DEV_STATE_NOT_OPER
:
563 sch
= to_subchannel(dev
->parent
);
565 return sprintf(buf
, "no path\n");
567 return sprintf(buf
, "no device\n");
569 /* All other states considered fine. */
570 return sprintf(buf
, "good\n");
574 static DEVICE_ATTR(chpids
, 0444, chpids_show
, NULL
);
575 static DEVICE_ATTR(pimpampom
, 0444, pimpampom_show
, NULL
);
576 static DEVICE_ATTR(devtype
, 0444, devtype_show
, NULL
);
577 static DEVICE_ATTR(cutype
, 0444, cutype_show
, NULL
);
578 static DEVICE_ATTR(modalias
, 0444, modalias_show
, NULL
);
579 static DEVICE_ATTR(online
, 0644, online_show
, online_store
);
580 static DEVICE_ATTR(availability
, 0444, available_show
, NULL
);
582 static struct attribute
*io_subchannel_attrs
[] = {
583 &dev_attr_chpids
.attr
,
584 &dev_attr_pimpampom
.attr
,
588 static struct attribute_group io_subchannel_attr_group
= {
589 .attrs
= io_subchannel_attrs
,
592 static struct attribute
* ccwdev_attrs
[] = {
593 &dev_attr_devtype
.attr
,
594 &dev_attr_cutype
.attr
,
595 &dev_attr_modalias
.attr
,
596 &dev_attr_online
.attr
,
597 &dev_attr_cmb_enable
.attr
,
598 &dev_attr_availability
.attr
,
602 static struct attribute_group ccwdev_attr_group
= {
603 .attrs
= ccwdev_attrs
,
606 static struct attribute_group
*ccwdev_attr_groups
[] = {
611 /* this is a simple abstraction for device_register that sets the
612 * correct bus type and adds the bus specific files */
613 static int ccw_device_register(struct ccw_device
*cdev
)
615 struct device
*dev
= &cdev
->dev
;
618 dev
->bus
= &ccw_bus_type
;
620 if ((ret
= device_add(dev
)))
623 set_bit(1, &cdev
->private->registered
);
628 struct ccw_dev_id dev_id
;
629 struct ccw_device
* sibling
;
633 match_devno(struct device
* dev
, void * data
)
635 struct match_data
* d
= data
;
636 struct ccw_device
* cdev
;
638 cdev
= to_ccwdev(dev
);
639 if ((cdev
->private->state
== DEV_STATE_DISCONNECTED
) &&
640 !ccw_device_is_orphan(cdev
) &&
641 ccw_dev_id_is_equal(&cdev
->private->dev_id
, &d
->dev_id
) &&
642 (cdev
!= d
->sibling
))
647 static struct ccw_device
* get_disc_ccwdev_by_dev_id(struct ccw_dev_id
*dev_id
,
648 struct ccw_device
*sibling
)
651 struct match_data data
;
653 data
.dev_id
= *dev_id
;
654 data
.sibling
= sibling
;
655 dev
= bus_find_device(&ccw_bus_type
, NULL
, &data
, match_devno
);
657 return dev
? to_ccwdev(dev
) : NULL
;
660 static int match_orphan(struct device
*dev
, void *data
)
662 struct ccw_dev_id
*dev_id
;
663 struct ccw_device
*cdev
;
666 cdev
= to_ccwdev(dev
);
667 return ccw_dev_id_is_equal(&cdev
->private->dev_id
, dev_id
);
670 static struct ccw_device
*
671 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem
*css
,
672 struct ccw_dev_id
*dev_id
)
676 dev
= device_find_child(&css
->pseudo_subchannel
->dev
, dev_id
,
679 return dev
? to_ccwdev(dev
) : NULL
;
682 void ccw_device_do_unbind_bind(struct work_struct
*work
)
684 struct ccw_device_private
*priv
;
685 struct ccw_device
*cdev
;
686 struct subchannel
*sch
;
689 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
691 sch
= to_subchannel(cdev
->dev
.parent
);
693 if (test_bit(1, &cdev
->private->registered
)) {
694 device_release_driver(&cdev
->dev
);
695 ret
= device_attach(&cdev
->dev
);
696 WARN_ON(ret
== -ENODEV
);
701 ccw_device_release(struct device
*dev
)
703 struct ccw_device
*cdev
;
705 cdev
= to_ccwdev(dev
);
706 /* Release reference of parent subchannel. */
707 put_device(cdev
->dev
.parent
);
708 kfree(cdev
->private);
712 static struct ccw_device
* io_subchannel_allocate_dev(struct subchannel
*sch
)
714 struct ccw_device
*cdev
;
716 cdev
= kzalloc(sizeof(*cdev
), GFP_KERNEL
);
718 cdev
->private = kzalloc(sizeof(struct ccw_device_private
),
719 GFP_KERNEL
| GFP_DMA
);
724 return ERR_PTR(-ENOMEM
);
727 static int io_subchannel_initialize_dev(struct subchannel
*sch
,
728 struct ccw_device
*cdev
)
730 cdev
->private->cdev
= cdev
;
731 atomic_set(&cdev
->private->onoff
, 0);
732 cdev
->dev
.parent
= &sch
->dev
;
733 cdev
->dev
.release
= ccw_device_release
;
734 INIT_WORK(&cdev
->private->kick_work
, NULL
);
735 cdev
->dev
.groups
= ccwdev_attr_groups
;
736 /* Do first half of device_register. */
737 device_initialize(&cdev
->dev
);
738 if (!get_device(&sch
->dev
)) {
739 /* Release reference from device_initialize(). */
740 put_device(&cdev
->dev
);
746 static struct ccw_device
* io_subchannel_create_ccwdev(struct subchannel
*sch
)
748 struct ccw_device
*cdev
;
751 cdev
= io_subchannel_allocate_dev(sch
);
753 ret
= io_subchannel_initialize_dev(sch
, cdev
);
762 static int io_subchannel_recog(struct ccw_device
*, struct subchannel
*);
764 static void sch_attach_device(struct subchannel
*sch
,
765 struct ccw_device
*cdev
)
767 css_update_ssd_info(sch
);
768 spin_lock_irq(sch
->lock
);
769 sch_set_cdev(sch
, cdev
);
770 cdev
->private->schid
= sch
->schid
;
771 cdev
->ccwlock
= sch
->lock
;
772 ccw_device_trigger_reprobe(cdev
);
773 spin_unlock_irq(sch
->lock
);
776 static void sch_attach_disconnected_device(struct subchannel
*sch
,
777 struct ccw_device
*cdev
)
779 struct subchannel
*other_sch
;
782 /* Get reference for new parent. */
783 if (!get_device(&sch
->dev
))
785 other_sch
= to_subchannel(cdev
->dev
.parent
);
786 /* Note: device_move() changes cdev->dev.parent */
787 ret
= device_move(&cdev
->dev
, &sch
->dev
);
789 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
790 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
791 cdev
->private->dev_id
.devno
, ret
);
792 /* Put reference for new parent. */
793 put_device(&sch
->dev
);
796 sch_set_cdev(other_sch
, NULL
);
797 /* No need to keep a subchannel without ccw device around. */
798 css_sch_device_unregister(other_sch
);
799 sch_attach_device(sch
, cdev
);
800 /* Put reference for old parent. */
801 put_device(&other_sch
->dev
);
804 static void sch_attach_orphaned_device(struct subchannel
*sch
,
805 struct ccw_device
*cdev
)
808 struct subchannel
*pseudo_sch
;
810 /* Get reference for new parent. */
811 if (!get_device(&sch
->dev
))
813 pseudo_sch
= to_subchannel(cdev
->dev
.parent
);
815 * Try to move the ccw device to its new subchannel.
816 * Note: device_move() changes cdev->dev.parent
818 ret
= device_move(&cdev
->dev
, &sch
->dev
);
820 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
821 "failed (ret=%d)!\n",
822 cdev
->private->dev_id
.ssid
,
823 cdev
->private->dev_id
.devno
, ret
);
824 /* Put reference for new parent. */
825 put_device(&sch
->dev
);
828 sch_attach_device(sch
, cdev
);
829 /* Put reference on pseudo subchannel. */
830 put_device(&pseudo_sch
->dev
);
833 static void sch_create_and_recog_new_device(struct subchannel
*sch
)
835 struct ccw_device
*cdev
;
837 /* Need to allocate a new ccw device. */
838 cdev
= io_subchannel_create_ccwdev(sch
);
840 /* OK, we did everything we could... */
841 css_sch_device_unregister(sch
);
844 spin_lock_irq(sch
->lock
);
845 sch_set_cdev(sch
, cdev
);
846 spin_unlock_irq(sch
->lock
);
847 /* Start recognition for the new ccw device. */
848 if (io_subchannel_recog(cdev
, sch
)) {
849 spin_lock_irq(sch
->lock
);
850 sch_set_cdev(sch
, NULL
);
851 spin_unlock_irq(sch
->lock
);
852 css_sch_device_unregister(sch
);
853 /* Put reference from io_subchannel_create_ccwdev(). */
854 put_device(&sch
->dev
);
855 /* Give up initial reference. */
856 put_device(&cdev
->dev
);
861 void ccw_device_move_to_orphanage(struct work_struct
*work
)
863 struct ccw_device_private
*priv
;
864 struct ccw_device
*cdev
;
865 struct ccw_device
*replacing_cdev
;
866 struct subchannel
*sch
;
868 struct channel_subsystem
*css
;
869 struct ccw_dev_id dev_id
;
871 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
873 sch
= to_subchannel(cdev
->dev
.parent
);
874 css
= to_css(sch
->dev
.parent
);
875 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
876 dev_id
.ssid
= sch
->schid
.ssid
;
878 /* Increase refcount for pseudo subchannel. */
879 get_device(&css
->pseudo_subchannel
->dev
);
881 * Move the orphaned ccw device to the orphanage so the replacing
882 * ccw device can take its place on the subchannel.
883 * Note: device_move() changes cdev->dev.parent
885 ret
= device_move(&cdev
->dev
, &css
->pseudo_subchannel
->dev
);
887 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
888 "(ret=%d)!\n", cdev
->private->dev_id
.ssid
,
889 cdev
->private->dev_id
.devno
, ret
);
890 /* Decrease refcount for pseudo subchannel again. */
891 put_device(&css
->pseudo_subchannel
->dev
);
894 cdev
->ccwlock
= css
->pseudo_subchannel
->lock
;
896 * Search for the replacing ccw device
897 * - among the disconnected devices
900 replacing_cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, cdev
);
901 if (replacing_cdev
) {
902 sch_attach_disconnected_device(sch
, replacing_cdev
);
903 /* Release reference from get_disc_ccwdev_by_dev_id() */
904 put_device(&replacing_cdev
->dev
);
905 /* Release reference of subchannel from old cdev. */
906 put_device(&sch
->dev
);
909 replacing_cdev
= get_orphaned_ccwdev_by_dev_id(css
, &dev_id
);
910 if (replacing_cdev
) {
911 sch_attach_orphaned_device(sch
, replacing_cdev
);
912 /* Release reference from get_orphaned_ccwdev_by_dev_id() */
913 put_device(&replacing_cdev
->dev
);
914 /* Release reference of subchannel from old cdev. */
915 put_device(&sch
->dev
);
918 sch_create_and_recog_new_device(sch
);
919 /* Release reference of subchannel from old cdev. */
920 put_device(&sch
->dev
);
924 * Register recognized device.
927 io_subchannel_register(struct work_struct
*work
)
929 struct ccw_device_private
*priv
;
930 struct ccw_device
*cdev
;
931 struct subchannel
*sch
;
935 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
937 sch
= to_subchannel(cdev
->dev
.parent
);
939 * Check if subchannel is still registered. It may have become
940 * unregistered if a machine check hit us after finishing
941 * device recognition but before the register work could be
944 if (!device_is_registered(&sch
->dev
))
946 css_update_ssd_info(sch
);
948 * io_subchannel_register() will also be called after device
949 * recognition has been done for a boxed device (which will already
950 * be registered). We need to reprobe since we may now have sense id
953 if (device_is_registered(&cdev
->dev
)) {
955 ret
= device_reprobe(&cdev
->dev
);
957 /* We can't do much here. */
958 CIO_MSG_EVENT(0, "device_reprobe() returned"
959 " %d for 0.%x.%04x\n", ret
,
960 cdev
->private->dev_id
.ssid
,
961 cdev
->private->dev_id
.devno
);
966 * Now we know this subchannel will stay, we can throw
967 * our delayed uevent.
969 sch
->dev
.uevent_suppress
= 0;
970 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
971 /* make it known to the system */
972 ret
= ccw_device_register(cdev
);
974 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
975 cdev
->private->dev_id
.ssid
,
976 cdev
->private->dev_id
.devno
, ret
);
977 spin_lock_irqsave(sch
->lock
, flags
);
978 sch_set_cdev(sch
, NULL
);
979 spin_unlock_irqrestore(sch
->lock
, flags
);
980 /* Release initial device reference. */
981 put_device(&cdev
->dev
);
985 cdev
->private->flags
.recog_done
= 1;
986 wake_up(&cdev
->private->wait_q
);
988 /* Release reference for workqueue processing. */
989 put_device(&cdev
->dev
);
990 if (atomic_dec_and_test(&ccw_device_init_count
))
991 wake_up(&ccw_device_init_wq
);
994 static void ccw_device_call_sch_unregister(struct work_struct
*work
)
996 struct ccw_device_private
*priv
;
997 struct ccw_device
*cdev
;
998 struct subchannel
*sch
;
1000 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1002 /* Get subchannel reference for local processing. */
1003 if (!get_device(cdev
->dev
.parent
))
1005 sch
= to_subchannel(cdev
->dev
.parent
);
1006 css_sch_device_unregister(sch
);
1007 /* Reset intparm to zeroes. */
1008 sch
->config
.intparm
= 0;
1009 cio_commit_config(sch
);
1010 /* Release cdev reference for workqueue processing.*/
1011 put_device(&cdev
->dev
);
1012 /* Release subchannel reference for local processing. */
1013 put_device(&sch
->dev
);
1017 * subchannel recognition done. Called from the state machine.
1020 io_subchannel_recog_done(struct ccw_device
*cdev
)
1022 struct subchannel
*sch
;
1024 if (css_init_done
== 0) {
1025 cdev
->private->flags
.recog_done
= 1;
1028 switch (cdev
->private->state
) {
1029 case DEV_STATE_NOT_OPER
:
1030 cdev
->private->flags
.recog_done
= 1;
1031 /* Remove device found not operational. */
1032 if (!get_device(&cdev
->dev
))
1034 sch
= to_subchannel(cdev
->dev
.parent
);
1035 PREPARE_WORK(&cdev
->private->kick_work
,
1036 ccw_device_call_sch_unregister
);
1037 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1038 if (atomic_dec_and_test(&ccw_device_init_count
))
1039 wake_up(&ccw_device_init_wq
);
1041 case DEV_STATE_BOXED
:
1042 /* Device did not respond in time. */
1043 case DEV_STATE_OFFLINE
:
1045 * We can't register the device in interrupt context so
1046 * we schedule a work item.
1048 if (!get_device(&cdev
->dev
))
1050 PREPARE_WORK(&cdev
->private->kick_work
,
1051 io_subchannel_register
);
1052 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1058 io_subchannel_recog(struct ccw_device
*cdev
, struct subchannel
*sch
)
1061 struct ccw_device_private
*priv
;
1063 sch_set_cdev(sch
, cdev
);
1064 cdev
->ccwlock
= sch
->lock
;
1066 /* Init private data. */
1067 priv
= cdev
->private;
1068 priv
->dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1069 priv
->dev_id
.ssid
= sch
->schid
.ssid
;
1070 priv
->schid
= sch
->schid
;
1071 priv
->state
= DEV_STATE_NOT_OPER
;
1072 INIT_LIST_HEAD(&priv
->cmb_list
);
1073 init_waitqueue_head(&priv
->wait_q
);
1074 init_timer(&priv
->timer
);
1076 /* Set an initial name for the device. */
1077 if (cio_is_console(sch
->schid
))
1078 cdev
->dev
.init_name
= cio_get_console_cdev_name(sch
);
1080 dev_set_name(&cdev
->dev
, "0.%x.%04x",
1081 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1083 /* Increase counter of devices currently in recognition. */
1084 atomic_inc(&ccw_device_init_count
);
1086 /* Start async. device sensing. */
1087 spin_lock_irq(sch
->lock
);
1088 rc
= ccw_device_recognition(cdev
);
1089 spin_unlock_irq(sch
->lock
);
1091 if (atomic_dec_and_test(&ccw_device_init_count
))
1092 wake_up(&ccw_device_init_wq
);
1097 static void ccw_device_move_to_sch(struct work_struct
*work
)
1099 struct ccw_device_private
*priv
;
1101 struct subchannel
*sch
;
1102 struct ccw_device
*cdev
;
1103 struct subchannel
*former_parent
;
1105 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
1108 former_parent
= to_subchannel(cdev
->dev
.parent
);
1109 /* Get reference for new parent. */
1110 if (!get_device(&sch
->dev
))
1112 mutex_lock(&sch
->reg_mutex
);
1114 * Try to move the ccw device to its new subchannel.
1115 * Note: device_move() changes cdev->dev.parent
1117 rc
= device_move(&cdev
->dev
, &sch
->dev
);
1118 mutex_unlock(&sch
->reg_mutex
);
1120 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1121 "0.%x.%04x failed (ret=%d)!\n",
1122 cdev
->private->dev_id
.ssid
,
1123 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
1124 sch
->schid
.sch_no
, rc
);
1125 css_sch_device_unregister(sch
);
1126 /* Put reference for new parent again. */
1127 put_device(&sch
->dev
);
1130 if (!sch_is_pseudo_sch(former_parent
)) {
1131 spin_lock_irq(former_parent
->lock
);
1132 sch_set_cdev(former_parent
, NULL
);
1133 spin_unlock_irq(former_parent
->lock
);
1134 css_sch_device_unregister(former_parent
);
1135 /* Reset intparm to zeroes. */
1136 former_parent
->config
.intparm
= 0;
1137 cio_commit_config(former_parent
);
1139 sch_attach_device(sch
, cdev
);
1141 /* Put reference for old parent. */
1142 put_device(&former_parent
->dev
);
1143 put_device(&cdev
->dev
);
1146 static void io_subchannel_irq(struct subchannel
*sch
)
1148 struct ccw_device
*cdev
;
1150 cdev
= sch_get_cdev(sch
);
1152 CIO_TRACE_EVENT(3, "IRQ");
1153 CIO_TRACE_EVENT(3, dev_name(&sch
->dev
));
1155 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1158 void io_subchannel_init_config(struct subchannel
*sch
)
1160 memset(&sch
->config
, 0, sizeof(sch
->config
));
1161 sch
->config
.csense
= 1;
1162 /* Use subchannel mp mode when there is more than 1 installed CHPID. */
1163 if ((sch
->schib
.pmcw
.pim
& (sch
->schib
.pmcw
.pim
- 1)) != 0)
1167 static void io_subchannel_init_fields(struct subchannel
*sch
)
1169 if (cio_is_console(sch
->schid
))
1172 sch
->opm
= chp_get_sch_opm(sch
);
1173 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1174 sch
->isc
= cio_is_console(sch
->schid
) ? CONSOLE_ISC
: IO_SCH_ISC
;
1176 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1177 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1178 sch
->schib
.pmcw
.dev
, sch
->schid
.ssid
,
1179 sch
->schid
.sch_no
, sch
->schib
.pmcw
.pim
,
1180 sch
->schib
.pmcw
.pam
, sch
->schib
.pmcw
.pom
);
1182 io_subchannel_init_config(sch
);
1185 static void io_subchannel_do_unreg(struct work_struct
*work
)
1187 struct subchannel
*sch
;
1189 sch
= container_of(work
, struct subchannel
, work
);
1190 css_sch_device_unregister(sch
);
1191 /* Reset intparm to zeroes. */
1192 sch
->config
.intparm
= 0;
1193 cio_commit_config(sch
);
1194 put_device(&sch
->dev
);
1197 /* Schedule unregister if we have no cdev. */
1198 static void io_subchannel_schedule_removal(struct subchannel
*sch
)
1200 get_device(&sch
->dev
);
1201 INIT_WORK(&sch
->work
, io_subchannel_do_unreg
);
1202 queue_work(slow_path_wq
, &sch
->work
);
1206 * Note: We always return 0 so that we bind to the device even on error.
1207 * This is needed so that our remove function is called on unregister.
1209 static int io_subchannel_probe(struct subchannel
*sch
)
1211 struct ccw_device
*cdev
;
1213 unsigned long flags
;
1214 struct ccw_dev_id dev_id
;
1216 cdev
= sch_get_cdev(sch
);
1218 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1219 &io_subchannel_attr_group
);
1221 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1222 "attributes for subchannel "
1223 "0.%x.%04x (rc=%d)\n",
1224 sch
->schid
.ssid
, sch
->schid
.sch_no
, rc
);
1226 * This subchannel already has an associated ccw_device.
1227 * Throw the delayed uevent for the subchannel, register
1228 * the ccw_device and exit. This happens for all early
1229 * devices, e.g. the console.
1231 sch
->dev
.uevent_suppress
= 0;
1232 kobject_uevent(&sch
->dev
.kobj
, KOBJ_ADD
);
1233 cdev
->dev
.groups
= ccwdev_attr_groups
;
1234 device_initialize(&cdev
->dev
);
1235 ccw_device_register(cdev
);
1237 * Check if the device is already online. If it is
1238 * the reference count needs to be corrected since we
1239 * didn't obtain a reference in ccw_device_set_online.
1241 if (cdev
->private->state
!= DEV_STATE_NOT_OPER
&&
1242 cdev
->private->state
!= DEV_STATE_OFFLINE
&&
1243 cdev
->private->state
!= DEV_STATE_BOXED
)
1244 get_device(&cdev
->dev
);
1247 io_subchannel_init_fields(sch
);
1248 rc
= cio_commit_config(sch
);
1251 rc
= sysfs_create_group(&sch
->dev
.kobj
,
1252 &io_subchannel_attr_group
);
1255 /* Allocate I/O subchannel private data. */
1256 sch
->private = kzalloc(sizeof(struct io_subchannel_private
),
1257 GFP_KERNEL
| GFP_DMA
);
1261 * First check if a fitting device may be found amongst the
1262 * disconnected devices or in the orphanage.
1264 dev_id
.devno
= sch
->schib
.pmcw
.dev
;
1265 dev_id
.ssid
= sch
->schid
.ssid
;
1266 cdev
= get_disc_ccwdev_by_dev_id(&dev_id
, NULL
);
1268 cdev
= get_orphaned_ccwdev_by_dev_id(to_css(sch
->dev
.parent
),
1272 * Schedule moving the device until when we have a registered
1273 * subchannel to move to and succeed the probe. We can
1274 * unregister later again, when the probe is through.
1276 cdev
->private->sch
= sch
;
1277 PREPARE_WORK(&cdev
->private->kick_work
,
1278 ccw_device_move_to_sch
);
1279 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1282 cdev
= io_subchannel_create_ccwdev(sch
);
1285 rc
= io_subchannel_recog(cdev
, sch
);
1287 spin_lock_irqsave(sch
->lock
, flags
);
1288 io_subchannel_recog_done(cdev
);
1289 spin_unlock_irqrestore(sch
->lock
, flags
);
1293 kfree(sch
->private);
1294 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1296 io_subchannel_schedule_removal(sch
);
1301 io_subchannel_remove (struct subchannel
*sch
)
1303 struct ccw_device
*cdev
;
1304 unsigned long flags
;
1306 cdev
= sch_get_cdev(sch
);
1309 /* Set ccw device to not operational and drop reference. */
1310 spin_lock_irqsave(cdev
->ccwlock
, flags
);
1311 sch_set_cdev(sch
, NULL
);
1312 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1313 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
1314 ccw_device_unregister(cdev
);
1315 put_device(&cdev
->dev
);
1316 kfree(sch
->private);
1317 sysfs_remove_group(&sch
->dev
.kobj
, &io_subchannel_attr_group
);
1321 static int io_subchannel_notify(struct subchannel
*sch
, int event
)
1323 struct ccw_device
*cdev
;
1325 cdev
= sch_get_cdev(sch
);
1328 return ccw_device_notify(cdev
, event
);
1331 static void io_subchannel_verify(struct subchannel
*sch
)
1333 struct ccw_device
*cdev
;
1335 cdev
= sch_get_cdev(sch
);
1337 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1340 static int check_for_io_on_path(struct subchannel
*sch
, int mask
)
1342 if (cio_update_schib(sch
))
1344 if (scsw_actl(&sch
->schib
.scsw
) && sch
->schib
.pmcw
.lpum
== mask
)
1349 static void terminate_internal_io(struct subchannel
*sch
,
1350 struct ccw_device
*cdev
)
1352 if (cio_clear(sch
)) {
1353 /* Recheck device in case clear failed. */
1356 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1358 css_schedule_eval(sch
->schid
);
1361 cdev
->private->state
= DEV_STATE_CLEAR_VERIFY
;
1362 /* Request retry of internal operation. */
1363 cdev
->private->flags
.intretry
= 1;
1366 cdev
->handler(cdev
, cdev
->private->intparm
,
1370 static void io_subchannel_terminate_path(struct subchannel
*sch
, u8 mask
)
1372 struct ccw_device
*cdev
;
1374 cdev
= sch_get_cdev(sch
);
1377 if (check_for_io_on_path(sch
, mask
)) {
1378 if (cdev
->private->state
== DEV_STATE_ONLINE
)
1379 ccw_device_kill_io(cdev
);
1381 terminate_internal_io(sch
, cdev
);
1382 /* Re-start path verification. */
1383 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1386 /* trigger path verification. */
1387 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1391 static int io_subchannel_chp_event(struct subchannel
*sch
,
1392 struct chp_link
*link
, int event
)
1396 mask
= chp_ssd_get_mask(&sch
->ssd_info
, link
);
1403 io_subchannel_terminate_path(sch
, mask
);
1408 io_subchannel_verify(sch
);
1411 if (cio_update_schib(sch
))
1413 io_subchannel_terminate_path(sch
, mask
);
1416 if (cio_update_schib(sch
))
1418 sch
->lpm
|= mask
& sch
->opm
;
1419 io_subchannel_verify(sch
);
1426 io_subchannel_shutdown(struct subchannel
*sch
)
1428 struct ccw_device
*cdev
;
1431 cdev
= sch_get_cdev(sch
);
1433 if (cio_is_console(sch
->schid
))
1435 if (!sch
->schib
.pmcw
.ena
)
1436 /* Nothing to do. */
1438 ret
= cio_disable_subchannel(sch
);
1440 /* Subchannel is disabled, we're done. */
1442 cdev
->private->state
= DEV_STATE_QUIESCE
;
1444 cdev
->handler(cdev
, cdev
->private->intparm
,
1446 ret
= ccw_device_cancel_halt_clear(cdev
);
1447 if (ret
== -EBUSY
) {
1448 ccw_device_set_timeout(cdev
, HZ
/10);
1449 wait_event(cdev
->private->wait_q
, dev_fsm_final_state(cdev
));
1451 cio_disable_subchannel(sch
);
1454 static int io_subchannel_get_status(struct subchannel
*sch
)
1458 if (stsch(sch
->schid
, &schib
) || !schib
.pmcw
.dnv
)
1460 if (sch
->schib
.pmcw
.dnv
&& (schib
.pmcw
.dev
!= sch
->schib
.pmcw
.dev
))
1461 return CIO_REVALIDATE
;
1467 static int device_is_disconnected(struct ccw_device
*cdev
)
1471 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
1472 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
1475 static int recovery_check(struct device
*dev
, void *data
)
1477 struct ccw_device
*cdev
= to_ccwdev(dev
);
1480 spin_lock_irq(cdev
->ccwlock
);
1481 switch (cdev
->private->state
) {
1482 case DEV_STATE_DISCONNECTED
:
1483 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1484 cdev
->private->dev_id
.ssid
,
1485 cdev
->private->dev_id
.devno
);
1486 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
1489 case DEV_STATE_DISCONNECTED_SENSE_ID
:
1493 spin_unlock_irq(cdev
->ccwlock
);
1498 static void recovery_work_func(struct work_struct
*unused
)
1502 bus_for_each_dev(&ccw_bus_type
, NULL
, &redo
, recovery_check
);
1504 spin_lock_irq(&recovery_lock
);
1505 if (!timer_pending(&recovery_timer
)) {
1506 if (recovery_phase
< ARRAY_SIZE(recovery_delay
) - 1)
1508 mod_timer(&recovery_timer
, jiffies
+
1509 recovery_delay
[recovery_phase
] * HZ
);
1511 spin_unlock_irq(&recovery_lock
);
1513 CIO_MSG_EVENT(4, "recovery: end\n");
1516 static DECLARE_WORK(recovery_work
, recovery_work_func
);
1518 static void recovery_func(unsigned long data
)
1521 * We can't do our recovery in softirq context and it's not
1522 * performance critical, so we schedule it.
1524 schedule_work(&recovery_work
);
1527 static void ccw_device_schedule_recovery(void)
1529 unsigned long flags
;
1531 CIO_MSG_EVENT(4, "recovery: schedule\n");
1532 spin_lock_irqsave(&recovery_lock
, flags
);
1533 if (!timer_pending(&recovery_timer
) || (recovery_phase
!= 0)) {
1535 mod_timer(&recovery_timer
, jiffies
+ recovery_delay
[0] * HZ
);
1537 spin_unlock_irqrestore(&recovery_lock
, flags
);
1540 static int purge_fn(struct device
*dev
, void *data
)
1542 struct ccw_device
*cdev
= to_ccwdev(dev
);
1543 struct ccw_device_private
*priv
= cdev
->private;
1546 spin_lock_irq(cdev
->ccwlock
);
1547 unreg
= is_blacklisted(priv
->dev_id
.ssid
, priv
->dev_id
.devno
) &&
1548 (priv
->state
== DEV_STATE_OFFLINE
);
1549 spin_unlock_irq(cdev
->ccwlock
);
1552 if (!get_device(&cdev
->dev
))
1554 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv
->dev_id
.ssid
,
1555 priv
->dev_id
.devno
);
1556 PREPARE_WORK(&cdev
->private->kick_work
, ccw_device_call_sch_unregister
);
1557 queue_work(slow_path_wq
, &cdev
->private->kick_work
);
1560 /* Abort loop in case of pending signal. */
1561 if (signal_pending(current
))
1568 * ccw_purge_blacklisted - purge unused, blacklisted devices
1570 * Unregister all ccw devices that are offline and on the blacklist.
1572 int ccw_purge_blacklisted(void)
1574 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1575 bus_for_each_dev(&ccw_bus_type
, NULL
, NULL
, purge_fn
);
1579 static void device_set_disconnected(struct ccw_device
*cdev
)
1583 ccw_device_set_timeout(cdev
, 0);
1584 cdev
->private->flags
.fake_irb
= 0;
1585 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
1587 ccw_device_schedule_recovery();
1590 void ccw_device_set_notoper(struct ccw_device
*cdev
)
1592 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
1594 CIO_TRACE_EVENT(2, "notoper");
1595 CIO_TRACE_EVENT(2, dev_name(&sch
->dev
));
1596 ccw_device_set_timeout(cdev
, 0);
1597 cio_disable_subchannel(sch
);
1598 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1601 static int io_subchannel_sch_event(struct subchannel
*sch
, int slow
)
1603 int event
, ret
, disc
;
1604 unsigned long flags
;
1605 enum { NONE
, UNREGISTER
, UNREGISTER_PROBE
, REPROBE
, DISC
} action
;
1606 struct ccw_device
*cdev
;
1608 spin_lock_irqsave(sch
->lock
, flags
);
1609 cdev
= sch_get_cdev(sch
);
1610 disc
= device_is_disconnected(cdev
);
1612 /* Disconnected devices are evaluated directly only.*/
1613 spin_unlock_irqrestore(sch
->lock
, flags
);
1616 /* No interrupt after machine check - kill pending timers. */
1618 ccw_device_set_timeout(cdev
, 0);
1619 if (!disc
&& !slow
) {
1620 /* Non-disconnected devices are evaluated on the slow path. */
1621 spin_unlock_irqrestore(sch
->lock
, flags
);
1624 event
= io_subchannel_get_status(sch
);
1625 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1626 sch
->schid
.ssid
, sch
->schid
.sch_no
, event
,
1627 disc
? "disconnected" : "normal",
1628 slow
? "slow" : "fast");
1629 /* Analyze subchannel status. */
1634 /* Check if paths have become available. */
1640 /* Ask driver what to do with device. */
1641 if (io_subchannel_notify(sch
, event
))
1644 action
= UNREGISTER
;
1646 case CIO_REVALIDATE
:
1647 /* Device will be removed, so no notify necessary. */
1649 /* Reprobe because immediate unregister might block. */
1652 action
= UNREGISTER_PROBE
;
1656 /* Get device operational again. */
1660 /* Perform action. */
1664 case UNREGISTER_PROBE
:
1665 ccw_device_set_notoper(cdev
);
1666 /* Unregister device (will use subchannel lock). */
1667 spin_unlock_irqrestore(sch
->lock
, flags
);
1668 css_sch_device_unregister(sch
);
1669 spin_lock_irqsave(sch
->lock
, flags
);
1671 /* Reset intparm to zeroes. */
1672 sch
->config
.intparm
= 0;
1673 cio_commit_config(sch
);
1676 ccw_device_trigger_reprobe(cdev
);
1679 device_set_disconnected(cdev
);
1684 spin_unlock_irqrestore(sch
->lock
, flags
);
1685 /* Probe if necessary. */
1686 if (action
== UNREGISTER_PROBE
)
1687 ret
= css_probe_device(sch
->schid
);
1692 #ifdef CONFIG_CCW_CONSOLE
1693 static struct ccw_device console_cdev
;
1694 static char console_cdev_name
[10] = "0.x.xxxx";
1695 static struct ccw_device_private console_private
;
1696 static int console_cdev_in_use
;
1698 static DEFINE_SPINLOCK(ccw_console_lock
);
1700 spinlock_t
* cio_get_console_lock(void)
1702 return &ccw_console_lock
;
1705 static int ccw_device_console_enable(struct ccw_device
*cdev
,
1706 struct subchannel
*sch
)
1710 /* Attach subchannel private data. */
1711 sch
->private = cio_get_console_priv();
1712 memset(sch
->private, 0, sizeof(struct io_subchannel_private
));
1713 io_subchannel_init_fields(sch
);
1714 rc
= cio_commit_config(sch
);
1717 sch
->driver
= &io_subchannel_driver
;
1718 /* Initialize the ccw_device structure. */
1719 cdev
->dev
.parent
= &sch
->dev
;
1720 rc
= io_subchannel_recog(cdev
, sch
);
1724 /* Now wait for the async. recognition to come to an end. */
1725 spin_lock_irq(cdev
->ccwlock
);
1726 while (!dev_fsm_final_state(cdev
))
1729 if (cdev
->private->state
!= DEV_STATE_OFFLINE
)
1731 ccw_device_online(cdev
);
1732 while (!dev_fsm_final_state(cdev
))
1734 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1738 spin_unlock_irq(cdev
->ccwlock
);
1743 ccw_device_probe_console(void)
1745 struct subchannel
*sch
;
1748 if (xchg(&console_cdev_in_use
, 1) != 0)
1749 return ERR_PTR(-EBUSY
);
1750 sch
= cio_probe_console();
1752 console_cdev_in_use
= 0;
1753 return (void *) sch
;
1755 memset(&console_cdev
, 0, sizeof(struct ccw_device
));
1756 memset(&console_private
, 0, sizeof(struct ccw_device_private
));
1757 console_cdev
.private = &console_private
;
1758 console_private
.cdev
= &console_cdev
;
1759 ret
= ccw_device_console_enable(&console_cdev
, sch
);
1761 cio_release_console();
1762 console_cdev_in_use
= 0;
1763 return ERR_PTR(ret
);
1765 console_cdev
.online
= 1;
1766 return &console_cdev
;
1770 const char *cio_get_console_cdev_name(struct subchannel
*sch
)
1772 snprintf(console_cdev_name
, 10, "0.%x.%04x",
1773 sch
->schid
.ssid
, sch
->schib
.pmcw
.dev
);
1774 return (const char *)console_cdev_name
;
1779 * get ccw_device matching the busid, but only if owned by cdrv
1782 __ccwdev_check_busid(struct device
*dev
, void *id
)
1788 return (strcmp(bus_id
, dev_name(dev
)) == 0);
1793 * get_ccwdev_by_busid() - obtain device from a bus id
1794 * @cdrv: driver the device is owned by
1795 * @bus_id: bus id of the device to be searched
1797 * This function searches all devices owned by @cdrv for a device with a bus
1798 * id matching @bus_id.
1800 * If a match is found, its reference count of the found device is increased
1801 * and it is returned; else %NULL is returned.
1803 struct ccw_device
*get_ccwdev_by_busid(struct ccw_driver
*cdrv
,
1807 struct device_driver
*drv
;
1809 drv
= get_driver(&cdrv
->driver
);
1813 dev
= driver_find_device(drv
, NULL
, (void *)bus_id
,
1814 __ccwdev_check_busid
);
1817 return dev
? to_ccwdev(dev
) : NULL
;
1820 /************************** device driver handling ************************/
1822 /* This is the implementation of the ccw_driver class. The probe, remove
1823 * and release methods are initially very similar to the device_driver
1824 * implementations, with the difference that they have ccw_device
1827 * A ccw driver also contains the information that is needed for
1831 ccw_device_probe (struct device
*dev
)
1833 struct ccw_device
*cdev
= to_ccwdev(dev
);
1834 struct ccw_driver
*cdrv
= to_ccwdrv(dev
->driver
);
1837 cdev
->drv
= cdrv
; /* to let the driver call _set_online */
1839 ret
= cdrv
->probe
? cdrv
->probe(cdev
) : -ENODEV
;
1850 ccw_device_remove (struct device
*dev
)
1852 struct ccw_device
*cdev
= to_ccwdev(dev
);
1853 struct ccw_driver
*cdrv
= cdev
->drv
;
1860 spin_lock_irq(cdev
->ccwlock
);
1861 ret
= ccw_device_offline(cdev
);
1862 spin_unlock_irq(cdev
->ccwlock
);
1864 wait_event(cdev
->private->wait_q
,
1865 dev_fsm_final_state(cdev
));
1867 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1868 "device 0.%x.%04x\n",
1869 ret
, cdev
->private->dev_id
.ssid
,
1870 cdev
->private->dev_id
.devno
);
1871 /* Give up reference obtained in ccw_device_set_online(). */
1872 put_device(&cdev
->dev
);
1874 ccw_device_set_timeout(cdev
, 0);
1879 static void ccw_device_shutdown(struct device
*dev
)
1881 struct ccw_device
*cdev
;
1883 cdev
= to_ccwdev(dev
);
1884 if (cdev
->drv
&& cdev
->drv
->shutdown
)
1885 cdev
->drv
->shutdown(cdev
);
1889 struct bus_type ccw_bus_type
= {
1891 .match
= ccw_bus_match
,
1892 .uevent
= ccw_uevent
,
1893 .probe
= ccw_device_probe
,
1894 .remove
= ccw_device_remove
,
1895 .shutdown
= ccw_device_shutdown
,
1899 * ccw_driver_register() - register a ccw driver
1900 * @cdriver: driver to be registered
1902 * This function is mainly a wrapper around driver_register().
1904 * %0 on success and a negative error value on failure.
1906 int ccw_driver_register(struct ccw_driver
*cdriver
)
1908 struct device_driver
*drv
= &cdriver
->driver
;
1910 drv
->bus
= &ccw_bus_type
;
1911 drv
->name
= cdriver
->name
;
1912 drv
->owner
= cdriver
->owner
;
1914 return driver_register(drv
);
1918 * ccw_driver_unregister() - deregister a ccw driver
1919 * @cdriver: driver to be deregistered
1921 * This function is mainly a wrapper around driver_unregister().
1923 void ccw_driver_unregister(struct ccw_driver
*cdriver
)
1925 driver_unregister(&cdriver
->driver
);
1928 /* Helper func for qdio. */
1929 struct subchannel_id
1930 ccw_device_get_subchannel_id(struct ccw_device
*cdev
)
1932 struct subchannel
*sch
;
1934 sch
= to_subchannel(cdev
->dev
.parent
);
1938 MODULE_LICENSE("GPL");
1939 EXPORT_SYMBOL(ccw_device_set_online
);
1940 EXPORT_SYMBOL(ccw_device_set_offline
);
1941 EXPORT_SYMBOL(ccw_driver_register
);
1942 EXPORT_SYMBOL(ccw_driver_unregister
);
1943 EXPORT_SYMBOL(get_ccwdev_by_busid
);
1944 EXPORT_SYMBOL(ccw_bus_type
);
1945 EXPORT_SYMBOL(ccw_device_work
);
1946 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id
);